9.1

CVE-2023-52441: ksmbd: fix out of bounds in init_smb2_rsp_hdr()

Modified
AliasesUBUNTU-CVE-2023-52441DEBIAN-CVE-2023-52441
Published 21-02-2024Last modified 15-08-2026

Vulnerability summary

CVE-2023-52441 is a critical (CVSS 9.1) vulnerability in linux. EPSS estimates a 0.68% chance of exploitation in the next 30 days, higher than 52.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.68%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Duplicates 1 · Related 2
USN-6725-1USN-6725-2CVE-2023-39178

Timeline

  1. 21-02-2024
    PublishedVulnerability first disclosed.
  2. 15-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix out of bounds in init_smb2_rsp_hdr() If client send smb2 negotiate request and then send smb1 negotiate request, init_smb2_rsp_hdr is called for smb1 negotiate request since need_neg is set to false. This patch ignore smb1 packets after ->need_neg is set to false.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.68%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.68% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu94 products
  • linux< 5.15.0-102.112
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1057.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 51a8534c0f35c0401e45f1055f914729cad98bf9, < 5c0df9d30c289d6b9d7d44e2a450de2f8e3cf40b | ≥ 0b3ec5671ac06829ccebdaeec05acedfec327f42, < 330d900620dfc9893011d725b3620cd2ee0bc2bc | ≥ 39b291b86b5988bf8753c3874d5c773399d09b96, < aa669ef229ae8dd779da9caa24e254964545895f | ≥ 39b291b86b5988bf8753c3874d5c773399d09b96, < 536bb492d39bb6c080c92f31e8a55fe9934f452b | cc32cd98a0aee4cc3eb611cbce11795b1aaa738a | ≥ 5.15.105, < 5.15.145 | ≥ 6.1.22, < 6.1.53 | ≥ 6.2.9, < 6.3 | 6.3
  • linux_kernel≥ 5.15.0, < 5.15.145 | ≥ 5.16.0, < 6.1.53 | ≥ 6.2.0, < 6.4.16
Debian1 product
  • linux< 6.1.55-1 | < 6.5.3-1

3 vendors · 97 products

References

10 links